set service dns dynamic interface eth0 service <dyndnsservice> server <server>

NOTE: This step is required when using afraid.org.

4. Commit the changes and save the configuration.

commit ; save

You can verify the status of the Dynamic DNS service with the show dns dynamic status operational mode command. By default, EdgeOS will only update Dynamic DNS when the IP address actually changes. To force and update, use the update dns dynamic interface <interface-name> operational command.